Localization and dephasing of conduction electrons in a low-carrier-density ferromagnet due to scattering on magnetic fluctuations is considered. We claim the existence of the `mobility edge', which separates the states with fast diffusion and the states with slow diffusion; the latter is determined by the dephasing time. When the `mobility edge' crosses the Fermi energy a large and sharp change of conductivity is observed. The theory provides an explanation for the observed temperature dependence of conductivity in ferromagnetic semiconductors and manganite pyrochlores.
|Number of pages
|Physica E: Low-Dimensional Systems and Nanostructures
|Published - Mar 2001
Bibliographical noteFunding Information:
This research was supported by The Israel Science Foundation founded by The Israel Academy of Sciences and Humanities.